Equity Activity - AOCI Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	$ 34,541	$ 27,588	$ 32,740	$ 27,393
Balance at the end of the period	36,206	27,990	36,206	27,990
Accumulated Other Comprehensive Income/(Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	(15,151)	(16,041)	(15,713)	(15,269)
Other comprehensive income before reclassifications			(68)	(572)
Amount reclassified from accumulated other comprehensive income			796	(142)
Other comprehensive income/(loss)	166	58	728	(715)
Balance at the end of the period	(14,985)	(15,983)	(14,985)	(15,983)
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period			(3,956)	(3,512)
Other comprehensive income before reclassifications			28	(494)
Amount reclassified from accumulated other comprehensive income			0	0
Other comprehensive income/(loss)	60	(140)	28	(494)
Balance at the end of the period	(3,928)	(4,005)	(3,928)	(4,005)
Net Unrealized Gains/(Losses) on Available- For-Sale Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period			0	0
Other comprehensive income before reclassifications			0	0
Amount reclassified from accumulated other comprehensive income			0	0
Other comprehensive income/(loss)	0	(1)	0	0
Balance at the end of the period	(1)	1	(1)	1
Net Unrealized Gains/(Losses) on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period			(157)	237
Other comprehensive income before reclassifications	(48)	14	(94)	(87)
Amount reclassified from accumulated other comprehensive income			336	(485)
Other comprehensive income/(loss)	(43)	84	241	(572)
Balance at the end of the period	85	(335)	85	(335)
Net Change Retirement- Related Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period			(11,600)	(11,994)
Other comprehensive income before reclassifications			(2)	8
Amount reclassified from accumulated other comprehensive income			461	343
Other comprehensive income/(loss)	150	115	459	351
Balance at the end of the period	$ (11,141)	$ (11,643)	$ (11,141)	$ (11,643)